<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      let arr = [1, 2, 3, 4, 5, 6, 7];

      // const r = arr.filter(function (v, i) {
      //   console.log(v);
      //   if (v >= 3 && v <= 6) {
      //     return true;
      //   }
      // });

      // const r = arr.filter((v) => v >= 3 && v <= 6);

      function inBetween(x, y) {
        return (v) => v >= x && v <= y;//闭包
      }
      // const r = arr.filter(inBetween(3, 6));
      const r = arr.filter(inBetween(4, 5));

      console.log(r);

      // console.log(arr.filter(inBetween(3, 6))); // 3,4,5,6

      // console.log(arr.filter(inArray([1, 2, 10]))); // 1,2
    </script>
  </body>
</html>
